511: Dual Disk Grinder Machine Safe Guarding

JTEKT, a bearing manufacturing company, commissioned our capstone team to enhance the safety of their 1967 Besly Dual Disk grinder. We addressed users unintentionally placing their fingers in pinch points on the machine’s loading area. Our goal was implementing a new safety standard to protect employees and minimize injuries while maintaining efficiency.

After deliberation, we determined a push finger sensor was the most effective design. Our solution utilized a limit switch integrated directly into the grinder’s power supply. When pressed, it immediately cuts power to the machine, preventing the dial from moving and eliminating injury risk.

We positioned the sensor near a brass wedge at the top of the machine, which seats improperly placed bearing retainers before grinding. This location had the highest accident rate. We made the limit switch accessible, ensuring operators can quickly trigger the stop mechanism.

Halfway through the project, we discovered a new lower pinch point after an injury at JTEKT. After consulting our sponsor, we designed a simple sheet steel cover preventing operators from pinching themselves at this location.

This safety mechanism and steel guard significantly improve operator safety and modernize the older machine with a practical solution. We expect the push finger sensor and lower pinch point cover to minimize user injury.